initial

backend/app/models/assignment.py

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+from datetime import datetime
+from enum import Enum
+from sqlalchemy import String, Text, DateTime, ForeignKey, Integer
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+
+
+class AssignmentStatus(str, Enum):
+    ACTIVE = "active"
+    COMPLETED = "completed"
+    DROPPED = "dropped"
+
+
+class Assignment(Base):
+    __tablename__ = "assignments"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    participant_id: Mapped[int] = mapped_column(ForeignKey("participants.id", ondelete="CASCADE"), index=True)
+    challenge_id: Mapped[int] = mapped_column(ForeignKey("challenges.id", ondelete="CASCADE"))
+    status: Mapped[str] = mapped_column(String(20), default=AssignmentStatus.ACTIVE.value)
+    proof_path: Mapped[str | None] = mapped_column(String(500), nullable=True)
+    proof_url: Mapped[str | None] = mapped_column(Text, nullable=True)
+    proof_comment: Mapped[str | None] = mapped_column(Text, nullable=True)
+    points_earned: Mapped[int] = mapped_column(Integer, default=0)
+    streak_at_completion: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    started_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+    completed_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
+
+    # Relationships
+    participant: Mapped["Participant"] = relationship("Participant", back_populates="assignments")
+    challenge: Mapped["Challenge"] = relationship("Challenge", back_populates="assignments")